1. lesson 3.notebook August 24, 2012
Lesson 3: Do not write this out!!
*Cover the 6 with your finger. How can you use the 11 & 5 to find
that the number under your finger is 6?
6
+5
11
*Cover the 11 with your finger. How can you use the 8 & 3 to find
that the number under your finger is 11?
11
- 8
3
1
2. lesson 3.notebook August 24, 2012
*equation - a statement that uses the symbol "=" to show that
2 quantities are equal
*unknown number (variable) - a value that is not given
...typically a letter is used
n + 24 = 95
2
3. lesson 3.notebook August 24, 2012
Lesson 3 Examples:
Find the unknown number in each problem.
A) A
+ 12
45
B) 32
+ B
60
3
